Diestock



I. W. NONNEMAN.

DIESTOCK.

APPLICATION FILED DEC.28, 191a.

Patented May 4, 1920.

3 SHEETS SHEET 2.

jF/VEMTO #w 10,. 71 i 73) Y J five/av: ya

|. w. NOQNNEMAN.

DIESTOCK.

APPLICATION FILED DEC.28, 1918.

3 SHEETSSHEET 3.

I/MWA j jw/f/vrala JM/M k w a Y Wu mmvw,

' flTTQKA/E ya quently chasers in aplane at right UNITED STATES PAT OFFICE,

IRA W. NONNEMAN, OF WARREN, OHIO, ASSIGN'OR TO THE BORDENCOM PANY, 0F WARREN, OHIO, A CORPORATION OF OHIO.

DIESTOCK.

Specification of Letters Patent.

Patented May'et, 1920.

Application filed December 28, 1918. Serial No. 268,624.

To all whom it may concern Be it known that I, IRA W. NONNEMAN, a citizen of the United States, residing at Warren, in the county of Trumbull and State of Ohio, have invented a certain new and useful Improvement in Diestocks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to die stocks of the type wherein the chasers are carried during operation in fixed position in the rotary frame. It is feasible to use the same chasers for cutting the threads on at least two different sizes of pipes, so that it is desirable to provide means for holding these chasers in different positions. The provision of simple and effective means for accomplishing this is one of the objects of this invention.

Another object of the invention is to definitely position guide blocks in correspondence with the position of the chasers. An other object is to provide guide blocks readily positionable for a number of sizes of pipes and each adapted to cooperate with a plurality of chasers, all positioned and locked by a very simple means. This provides for using the same die stock frame and mechanism for a large number of sizes of pipes, the only substitution required being the chasers themselves.

In cutting threads on pipes it is fredesirable to vary the depth of cut slightly from the standard, making it of either reater or less depth as the case may be. llIy invention provides very simple means for accomplishing this without inter fering with the ready and accurate return of the die stock to standard.

The characteristics of my invention are illustrated in the drawings, and explained in the following detailed description, and are summarized in the claims.

In the drawings, Figure 1 is an elevation of the die stock looking at the face adjacent to the chasers; Fig. 2 is an elevation of the opposite side, that is looking at the face adjacent to the guide blocks; Fig. 3 is an edge view of the die stock, being a plan of the device when in the position shown in Fig. 1; Fig. 4; is a radial section of the die stock, this view being taken on angular'radial planes, as indicated by the line H on Fig. 1.; Fig. 5 is a cross section through the angles to the axis of the die stock, as indicated by thecumferential webs 14:, connecting the barrel, the houslngs 11 and sockets 13, circumferential webs 15 connecting the housings 12 with the barrel, and the lateral webs 17 and 18 bracing the housings and'handle-sockets. The frame described may be .one single integral casting.

' The chasersare designated 20. They are rectangular prisms mounted in rectangular radial grooves in the bosses 11, being housed in said grooves by plates 21 secured by screws to the bosses. The chasers thus occupy open-ended parallel sided recesses. Similarly the guide blocks, designated 30, are radial members mounted in Ways in the bosses 12, being housed therein by plates 31 secured to these bosses by screws.

- To lockv the chasers and guide blocks in place in as simple a manner as possible, I form notches 22 and 32 in the sides of these .members and I provide a bushing 40 adaptoccupying the notches 22 and 32. .The width of the bushing slots 41 is less than the Width of a chaser or guide block being slightly greater than the distance from the base of a notch to the other side ofthe chaser or guide block. These notches are on opposite sides of the chasers or guide blocks, whereby they may have the proper dimensions without interference with each other.

The chasers shown haveonly two different standard positions, but the frame is readily adaptable for carrying chasers for still other sizes of pipe, and I find that I can readily make theframe to carry, for example, three different sets of chasers, each set having two positions provided by two notches thereon. The same frame may therefore readily provide for cutting six sizes of pipe. To accommodate these sizes I provide six positions for the guide blocks; thus, in the illustration given, there are shown three notches 32 on each side of the guide block, any notch being adapted to be occupied by the adjacent edge of the locking bushing 40.

To enable the chasers to be adjusted in or out slightly from the standard, I make the bushing slightly tapered andcorrespondingly taper the notches 22, and I provide for a slight adjustment longitudinally of the position of this sleeve. To readily and accurately control this adjustment I thread the head end of the sleeve 40, as shown at 43, and I mount on this thread a nut 50, which, by abutting the housing plates 21 for the chasers limits the inward movement of the sleeve. The bushing is locked in place by tightening a set screw 55,which screws through the barrel 10 against the bushing and has on its outer end a knurled head for convenience of manipulation.

The abutment nut is preferably a threaded strap having outwardly turned ears 52, Fig. 1, drawn together bya screw 7 53. The tightening of this screw clamps the zero position of this nut which corresponds to the standard position of the chasers.

The graduations described enable the operator to set the die stock the desired amount above or below standard and readily bring it back to an accurate standard whenever desired. I find that if the thread 43 is made of steep pitch less than half a turn of the nut 50 will give a suffithis giving the desired steep pitch.

As shown in Fig. 4: the taper of the bush ing 40 extends from about the closed ends of the slots 41 continuously to the opposite end. This results in giving a slight adjustment to the guide blocks when the chasers are varied from the standard. The

usual clearance of the guide blocks on the pipe renders this adjustment of them immaterial. If desired, however, the portion of the sleeve 40 which passes through the guide block notches may have a purely cylindrical inner face, so that the guide blocks would not be varied at all during the adjustment of the chasers.

In changing the chasers and guide blocks from one size to another a convenient method of procedure is as'follows: First the die stock is laid on a suitable table or horizontal support with the face adjacent to the guide blocks downward; then the screw 55 is loosened and the bushing 40 is taken entirely out of the die stock. I then shove the chasers 2O radially outward until their cutting edges are substantially flush with the bore of the frame barrel. This affords an unobstructed view of the guide blocks and they may be set to any position desired, the outer edges of the notches to be engaged being left standing in registration with the inner face of the frame barrel 10; then the chasers are positioned with the notches desired registering at their outer edges with the inner face of the frame barrel; then the bushing is slipped into place, the slots thereof straddling the chasers and guide blocks and the desired notches in the chasers and guide blocks being engaged by the sleeve. When the sleeve is in position the tightening of the nut 55 locks the parts rigidly together.

Having thus described my invention what I claim is I 1. In a die stock, the combination of a frame, chasers and guide blocks carried thereby, and a longitudinally movable tapered sleeve engaging and positioning both the chasers, and guide blocks.

2. In a die stock, the combination of a frame, chasers and guide blocks carried thereby, and a bushing adapted to extend within the frame and engaging and positioning the chasers and guide blocks.

3. In a die stock, the combination, with a frame, of a set of guide blocks carried thereby, a set of chasers carried thereby, said guide blocks and chasers being each provided with transverse shoulders, and a slotted bushing adapted to be inserted within the frame and engage the shoulders of both the chasers and the guide blocks.

4. In a die stock, the combination, with a frame, a setv of'movable guide blocks carried thereby, a set of movable chasers carried thereby, said guide blocks and chasers being each provided with transverse grooves, a slotted bushing adapted to be inserted within the frame and extend into the grooves of the chasers and guide blocks, and means for locking the bushing in place.

5. In a die stock, the combination, with a rotary frame, of radial chasers slidably mounted in housings carried by the frame, radial guide blocks slidably mounted in housings carried by the frame, said chasers and guide blocks having shoulders differently positioned with reference to the inner end of such member, a bushing adapted to occupy the frame and having slots to ac commodate the chasers and guide blocks, the wall of the bushing adjacent to such slots being adapted to engage the shoulders on the chasers and guide blocks.

6. In a die stock, the combination, of a rotary frame, chasers slidably mounted in housings carried by the frame, guide blocks respectively alined with the chasers and slidably mounted in housings carried by the frame, said chasers and guide blocks having shoulders differently positioned with reference to the inner end of such member, a bushing adapted to occupy the frame and having slots each adapted to accommodate both a chaser and a guide block, the Wall of the bushing adjacent to such slot being adapted to engage the shoulders on such chaser and guide block.

7. In a die stock, the combination of a frame having an internally cylindrical barrel and two sets of radial housings projecting outwardly therefrom, radial chasers occupying one set of housings, radial guide blocks occupying the other set of housings, and a slotted bushing adapted to snugly occupy the barrel and having slots for enabling it to straddle both the chasers and guide blocks, said chasers and guide blocks having notches variably positioned, which the Wall of the bushing adjacent to its slots is adapted to occupy.

8. The combination of a die stock frame, a set of housings carried thereby for chasers, another set of housings carried thereby for guide blocks, a plurality of sets of chasers adapted to occupy the chaser housings and having differently positioned notches in them, uide blocks adapted to occupy the guide lock housings and each having notches positioned for all the sets of chasers, and a positioning device adapted to engage notches of the chasers and guide blocks.

9. The combination of a die stock frame having a barrel and a set of housings for chasers and another set of housin s for guide blocks, a plurality of sets of c asers adapted to occupy the chaser housings and having differently positioned notches in them, guide blocks adapted to occupy the guide-block housings and having notches positioned for all the sets of chasers, and a bushing adapted to occupy the bores of said barrel and engage the notches of the chasers and guide blocks.

10. In a die stock, the combination of a frame having housings for chasers and housings for guide blocks, and a tapered sleeve adapted to occupy said frame and having slots adapted to extend over the guide blocks and chasers, the guide blocks and chasers having shoulders adapted to be engaged by the wall of the sleeve adjacent to its slots, the sleeve where it crosses the chasers being tapered and the cooperating shoulder on the chasers being correspondingly tapered.

11. In a die stock, the combination of a frame having housings for chasers and housings for guide blocks, and a tapered sleeve adapted to occupy said frame and having slots adapted to extend over the guide blocks and chasers, said guide blocks and chasers having notches adapted to be occupied by the wall of the sleeve adjacent to its slots, the sleeve being tapered on its inner face and the notches of the chasers having their inner walls correspondingly tapered, and means for holding the sleeve in different longitudinal positions.

12. In a die stock, the combination of a frame having housings for carrying a set of chasers, other housings for carrying a set of guide blocks, chasers and guide blocks adapted to occupy said housings and each having notches, a bushing adapted to occupy the bore of the frame and extend through the notches of both the chasers and guide blocks, said bushing being internally taperedand the chasers having correspondingly tapered shoulders at the edges of their notches, an adjustable nut screwing onto the projecting portion of the bushing and forming a variable abutment for it, and means for locking the nutin various positions.

In testimony whereof I hereunto affix my signature.

IRA W, NONNEMAN 

